stringstream
时间: 2023-09-07 19:15:37 浏览: 32
stringstream是C++标准库中的一个类,用于对字符串进行输入输出操作。它可以把一个字符串转换成流,然后像处理输入输出流一样进行读写操作。通过stringstream,我们可以方便地将字符串进行格式化和解析,也可以将多个数据类型转换成一个字符串。例如,我们可以使用stringstream将多个整数拼接成一个字符串,或者将一个字符串解析成多个整数等。在使用stringstream时,需要包含头文件<sstream>。
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StringStream
C++中的stringstream是一个流类,它可以将字符串转换为数字、将数字转换为字符串等。stringstream类定义在头文件<sstream>中,使用时需要包含该头文件。
stringstream类的主要用法如下:
1. 将字符串转换为数字
可以使用stringstream类将字符串转换为数字,例如:
```
#include <iostream>
#include <sstream>
using namespace std;
int main()
{
string str = "123";
int num;
stringstream ss(str);
ss >> num;
cout << num << endl;
return ;
}
```
输出结果为:
```
123
```
2. 将数字转换为字符串
可以使用stringstream类将数字转换为字符串,例如:
```
#include <iostream>
#include <sstream>
using namespace std;
int main()
{
int num = 123;
stringstream ss;
ss << num;
string str = ss.str();
cout << str << endl;
return ;
}
```
输出结果为:
```
123
```
3. 将多个数据类型转换为字符串
可以使用stringstream类将多个数据类型转换为字符串,例如:
```
#include <iostream>
#include <sstream>
using namespace std;
int main()
{
int num = 123;
double d = 3.14;
string str = "hello";
stringstream ss;
ss << num << " " << d << " " << str;
string result = ss.str();
cout << result << endl;
return ;
}
```
输出结果为:
```
123 3.14 hello
```
以上就是stringstream类的主要用法。
Stringstream
Stringstream is a class in C++ that allows you to read and write strings as if they were input/output streams. It is used for converting strings to numerical values, parsing strings, and formatting output. The class is defined in the header file <sstream>. The stringstream class allows you to treat a string as if it were a stream, which means you can use all the standard stream input/output operations on it. This includes inserting data into the string, extracting data from the string, and formatting the string using manipulators. The stringstream class is especially useful when you need to parse a string into individual tokens, or when you need to convert a string into a numerical value.
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